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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.VNCache
* File: ClusterNodeIndex.cs
*
* ClusterNodeIndex.cs is part of VNLib.Plugins.Extensions.VNCache which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.VNCache is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Extensions.VNCache is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System.Threading;
using System.Threading.Tasks;
using VNLib.Utils.Logging;
using VNLib.Data.Caching.Extensions;
using VNLib.Data.Caching.Extensions.Clustering;
using VNLib.Plugins.Extensions.Loading.Events;
namespace VNLib.Plugins.Extensions.VNCache.Clustering
{
internal sealed class ClusterNodeIndex : IClusterNodeIndex, IIntervalScheduleable
{
private readonly CacheClientConfiguration _config;
private Task _currentUpdate;
public ClusterNodeIndex(CacheClientConfiguration config)
{
_config = config;
_currentUpdate = Task.CompletedTask;
}
///<inheritdoc/>
public CacheNodeAdvertisment? GetNextNode()
{
//Get all nodes
CacheNodeAdvertisment[] ads = _config.NodeCollection.GetAllNodes();
//Just get a random node from the collection for now
return ads.Length > 0 ? ads.SelectRandom() : null;
}
///<inheritdoc/>
public Task WaitForDiscoveryAsync(CancellationToken cancellationToken)
{
return _currentUpdate.WaitAsync(cancellationToken);
}
/// <summary>
/// Runs the discovery process and updates the current update task
/// </summary>
/// <param name="log"></param>
/// <param name="cancellationToken">A token to cancel the operation</param>
/// <returns>A task that completes when the discovery process is complete</returns>
public Task OnIntervalAsync(ILogProvider log, CancellationToken cancellationToken)
{
//Run discovery operation and update the task
_currentUpdate = _config.DiscoverNodesAsync(cancellationToken);
return Task.CompletedTask;
}
}
}
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